overhaul

UK: verb: /ˌəʊvə^rˈhɔːl/, noun: /ˈəʊvə^rhɔːl/

US: /v. ˌoʊvɚˈhɔl, ˈoʊvɚˌhɔl; n. ˈoʊvɚˌhɔl/

US: (v. ō′vər hôl′, ō′vər hôl′; n. ō′vər hôl′)

WordReference Random House Learner's Dictionary of American English © 2025

o•ver•haul /v. ˌoʊvɚˈhɔl, ˈoʊvɚˌhɔl; n. ˈoʊvɚˌhɔl/   v. 

[~ + object]
1. to make necessary repairs on (something):
   to overhaul an old engine.
2. to examine completely and revise:
   to overhaul a school curriculum.
3. to come closer to, catch up with, or overtake:
   The police tried desperately to overhaul the fleeing assassin.

n. 

4. Also, ˈo•verˌhaul•ing. a complete and general examination of something, with repairs or changes if necessary:
   [uncountable] The old engines were in need of overhaul.
   [countable] a simple overhaul of the procedures.

WordReference Random House Unabridged Dictionary of American English © 2025

o•ver•haul  (v. ō′vər hôl′, ō′vər hôl′;n. ō′vər hôl′), v.t. 

1. to make necessary repairs on;
   restore to serviceable condition:
   My car was overhauled by an expert mechanic.
2. to investigate or examine thoroughly for repair or revision:
   Next year we're going to overhaul the curriculum.
3. to gain upon, catch up with, or overtake, as in a race.
4. to haul or turn over for examination.
5. [Naut.]
   • Naval Terms to slacken (a rope) by hauling in the opposite direction to that in which the rope was drawn taut.
   • Naval Terms to release the blocks of (a tackle).

n. 

6. Also, o′ver•haul′ing. a general examination and repair:
   The state roads were badly in need of a major overhaul.

• over- + haul 1620–30

o′ver•haul′er, n. 

Collins Concise English Dictionary © HarperCollins Publishers::

overhaul verb / ˌəʊvəˈhɔːl/(transitive)

1. to examine carefully for faults, necessary repairs, etc
2. to make repairs or adjustments to (a car, machine, etc)
3. to overtake

noun / ˈəʊvəˌhɔːl/

1. a thorough examination and repair